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Re: st: Interpretation of sts list


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Interpretation of sts list
Date   Thu, 15 Nov 2007 07:35:48 +0000 (GMT)

--- Christina M Gibson-Davis <cgibson@duke.edu> wrote:
> I am having difficulty interpreting the "survivor function" column of
> sts list. I had thought it reported the percentage of cases that had
> survived during a particular time interval, and thus it would be
> possible to tell, by looking at the last entry, how many cases had
> survived without failing. However, by using the cancer data available
> through Stata (webuse cancer), I see that this cannot be.
> 
> If I type:
> webuse cancer
> stset study died
> stdes
> 
> I see that there are 48 subjects, and 31 failed, for a survival rate
> of 35%  (48-31=17; 17/48 = 35%).
> 
> But if I type "sts list, at(0 5 to 39)", I end up with a survival
> rate of 19% (please see below).

I am going step by step through the logic and the underlying
calculations in section 3 of:
http://home.fsw.vu.nl/m.buis/wp/survival.html

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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